Stoker.



J. HARRINGTON.

STOKER.

APPLlCATION FILED MAY21, 1919.

1,326, 590. Patented Dec. 30, 1919.

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STOKER.

APPLICATION FILED MAY 21. 1919.

'? ,,326,590. Patented Dec. 30,1919;

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JOSEPH ERINGTUN, 0F RIVERSIDE, ILLINOIS.

arcane.

Specification of Letters Patent.

Patented lace. 3-9, 19119.

Application filed May 21, 1919. terial No. 298,586.

To all whom 2'?) may concern Be it known that l, Josurrr HARRINGTON, a citizen of the United States, residing at Riverside, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Stokers, of which the following is a specification.

My invention relates to certain new and useful improvements in stokers and is fully described and explained in the specification and shown in the accompanying drawings in which I igure 1 is a side elevation of a Stoker-embodying my improvement; Fig. 2 is the top plan of a surface of the traveling grate; Fig. 3 is a side elevation of one of the grate bars, and Fig. 4 is a bottom plan of one of the grate bars.

Referring to the drawings, 5 is one of the wheels or rollers at the forward end of the stoker and over which the traveling chain thereof passes. 6 are the chain links Which are constructed and operated in the usual manner common in stokers of the general class here under consideration. The links carry transverse bars 7, each of which is in the form of an angle iron, having a normally horizontal and a vertical flange, the vertical flange terminatirig in an enlarged transverse head 8.

The grate bars are carried by the heads 8 of the transverse bar 7 as illustrated, each grate bar being provided with downward extension 9 slotted to fit over the head. The bars extend both forward and backward from this downward extension by which they are supported, and the rear end of each grate bar terminates substantially above the pivot connecting the chain link 6 by which it is carried with the adjoining link in the rear thereof. This is one important feature of my invention. and its importance can be understood by reference to Fig. l of the drawings Without further reference to the detailed construction of the grate bar which is illustrated in the other figures. in the operation of traveling grate stokers of the general character of the one here illustrated in the drawing and in which the travel is from left to right as indicated by the arrow in Fig. 1 the grate bars have usually been constructed so that as they rounded the wheel or roller at the ash discharge or inward end of the grate the rear end of each grate bar was well to the rear of the point about which the link which carried it was about to turn. As a result each grate bar in succession as it rounded the wheel or roller at the end of the stoker raised its rear end up into the mass of fuel on the grate surface, and as a result the rear end of the grate bars of the general character here under consideration have been rapidly deteriorated owing to excessive over-heating.

In the present construction the grate bars are mounted on the heads 8 of the transverse bars 7. and thus well forward with reference to the chain links which carry them so that the rear ends of the respective grate bars are about over the rear pivots of the links. As a result when the chain begins to bend in passing around the wheels or rollers at the inward end of the stoker, the individual grate bars move as shown in dotted lines, the rear ends never projecting up into the fuel bed. This result of course could be accomplished providing only that the rear endsof the bars were not behind the pivots substantially, for it is obvious that the rear ends of the grate bars might be still farther forward with reference to the rear pivot of their respective carrying links without interfering with the mode of operation stated.

The construction of the individual grate bars is fully illustrated in the detailed dravw ings thereof. Each has a broad central por tion 10 immediately above the downward extension 9, and it has symmetrically arranged diagonally opposite, forward andrear extensions ll-and 12 as illustrated in Fig. 2. The lower part of the grate bar is cut away leaving suitable ribs for strength. The arrangement is such that as the grate bars are threaded on to the transverse bars and in contact with each other there is left between the rows of grate bars a narrow vertical passage for draft, and the bars are entirely symmetrical so that they can be reversed if desired.

In the operation of the grate constructed of bars of this form the entire structure is self cleaning, for as each row of bars rounds the roller at the inward end of the stoker it is drawn positively forward and downward away from the following row of bars, and all ash and clinker which may have accumulated between the rows is dropped out.

if realize that considerable variation is possible in the details of the construction herein shown, and it do not intend to limit myself thereto, except as pointed out in the follow llll when

ing claims, in which it is my intention to clainival'l the novelty inherent in the device as broadly as is permitted by the state of the art.

I claim:

1. In combination a carrier formed of links pivoted together a series of longitudily extending grate bars carried by and ve the links and having their centers artheir rear ends substantially as far for as the rear pivots of the carrying a, whereby, as the links pivot upon each other the rear ends of the grate bars swing forward and downward with respect to the following grate bars.

2. ln combination a carrier formed of links pivoted together, a series of longitudinally extending grate bars of greater length than the links and carried by and above the links having their centers arranged forward of the centers of the links and having their ends overlappin the grate bars carried by the adjacent lin 5 forward and backward, the rear end of the grate bars being located substantially as far forward as the rear pivots of their carrying links whereby, as

red forward of the centers of the links narrates the links pivot upon each other the rear ends of the grate bars swing forward and downward with respectito the following grate bars carried by each transverse bar i overlapping the ends of the grate bars carried by the adjacent transverse bars to front and rear, the rear end of each set of grate bars being located substantially as far forward as the rear pivots of its carrying links whereby as the links pivot upon each other the rear ends of the grate bars swing forward and downward with respect to the 0L lowing grate bars.

In testimony whereof l have hereunto set my hand and seal this 12th day 01 -May 1919.,

Josnrn naeiainoroiv. [1,. s]

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